George was born on July 22, 2013, at St Mary's Hospital in London. On his 12th birthday Tuesday, William and Kate shared a new photo of George on social media, as well as a video of George playing with his two siblings, Princess Charlotte and Prince Louis.

A rule that the royal family has just for future monarchs explains why we won't see Prince William traveling with Prince George anymore.

It's another royal birthday! Prince George, the oldest son of Prince William and Kate Middleton, turned 12 years old on Tuesday (July 22), and as is tradition with the royal family, he was honored with a new portrait and birthday shoutout on social media.